Central Bureau for Astronomical Telegrams
IAUC 4588: X-RAY N IN Vul; N LMC; 1988e; Corrs
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4589
Circular No. 4588
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
X-RAY NOVA IN VULPECULA
F. Makino and the Ginga Team, Institute of Space and
Astronautical Science, Sagamihara, Kanagawa, used the Ginga large-area
counters on Apr. 29 and 30 to refine the position of this object (cf.
IAUC 4587) to R.A. = 20h01m.1, Decl. = +25.1 deg (equinox 1950.0),
with an error box of +/- 1m in R.A. and +/- 0.1 deg in Decl. No
further change in intensity and spectrum was noted since Apr. 27.
R. H. McNaught, Siding Spring Observatory, reports that his
examination of 85-mm lens patrol shots of the area taken on Apr. 19.79
and 26.79 UT shows no change to mag 11.5.
NOVA IN THE LARGE MAGELLANIC CLOUD
A. Cassatella and R. Gonzalez Riestra, ESA International
Ultraviolet Explorer Observatory, Villafranca, report: "Ultraviolet
low-resolution monitoring with IUE shows that the integrated flux in
the range 130-160 nm had increased by factors of 10.0, 15.7, 25.7 and
30.3 on Apr. 7.3, 13.2, 19.3 and 26.1 UT, respectively, relative to
the first observations on Mar. 26.3 UT. The flux changes are
accompanied by a progressive hardening of the ultraviolet continuum,
and by the appearance and strengthening of strong emission lines from
Mg II, Fe II, Ni II, Si II, etc. High-resolution observations on Apr.
27 indicate expansion velocities of about 800 km/s in Mg II. The
decline rate in V (as derived from the fine-error sensor on board
IUE), as well as the expansion velocities, the intrinsic luminosity
and the spectral development in the ultraviolet, are all reminiscent
of the behavior of Nova V1668 Cyg 1978 in the early outburst and
transition phases."
Visual magnitude estimates by McNaught: Apr. 23.39 UT, 13.5;
24.38, 13.5; 26.38, 13.5.
COMET LEVY (1988e)
Total visual magnitude estimate by D. Levy, Tucson, AZ (0.9-m
reflector): Apr. 24.48 UT, 13.0:.
CORRIGENDA
IAUC 4582: Periodic Comet Tempel 2 (1987g), line 1. For Institite read
Institute
IAUC 4584: Supernova 1987A in the Large Magellanic Cloud, line 4 from
foot. For fom read from
1988 May 2 (4588) Brian G. Marsden
Read IAUC 4589
Our Web policy. Index to the CBAT/MPC/ICQ pages.
